what is a movie screen made of

　　Movies are played by projecting them onto a screen using a movie projector. In pursuit of a better movie viewing experience, movie screens are constantly being updated, from white walls, white cloths to screens, to giant screens and dome screens, and the cost is getting higher and higher. Many screens can be worth hundreds of thousands of dollars.

　　To make a screen that satisfies the audience experience, there are many factors to consider, the first is the visual effect - gain.

　　Gain is a unit of measure that measures the strength of screen reflections. At present, most cinemas on the market will choose a screen with a gain of 1.4-1.8, because the screen with a gain in this range has a better visual effect, and the light can be focused into a concentrated pattern, and the focused pattern is bright and uniform, which can satisfy the audience's view. film needs.

　　The second is sound transmission. To optimize the transmission of sound, one structure is crucial - the sound-transmitting hole. In order to ensure the sound effect, generally cinemas will set up three speakers on the left, center and right behind the screen. The sound from the speakers is transmitted to the audience through the tens of thousands of sound-transmitting holes densely covered on the screen, giving people an immersive experience. a feeling of.

　　The last is the choice of material. The screen material of the cinema is generally made of polyethylene film, which is covered with a thin layer of magnesium carbonate. Magnesium carbonate has a good reflection effect, does not absorb light, and has an excellent visual effect. In addition to the polyethylene film mentioned above, the screen materials on the market include white plastic, glass beads and metal curtains.

　　Among them, compared with other screens, the metal screen can not only overcome a series of disadvantages such as indistinct black and white and unclear images, but also meet higher movie viewing needs, such as showing 3D movies.

　　Although it is called "metal curtain", it is not as hard as metal. The metal curtain used in cinemas is covered with a thin layer of metal powder. Touching it will cause the metal powder to fall off and accelerate the oxidation of the metal powder, thereby damaging it. Screen. Moreover, the metal curtain is a whole, which can neither be partially repaired nor partially replaced. Once damaged, the entire curtain can only be replaced.

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Zeigarnik effect

　　As a freelancer, you have to fight procrastination every day. "I've made up my mind many times, but I just can't change it. Is it because I'm slow or slow?". In fact, many procrastinations are irrational. Many obstructions are imagined by myself. So distract, postpone, avoid confrontation. It's cool to procrastinate, and it's cool to procrastinate all the time, so I can't do it. Concentration is also related to physical strength. When the physical strength is exhausted, it is even more difficult to concentrate. You’ll tell yourself: I’m too tired to do this—okay, another perfect procrastination. 　　In 1927, Bruma Zeigarnik's senior research found that people are more likely to care about unfinished and interrupted work than completed work. This is the Zeigarnik effect. For example, we often don't care much about what we have got, but we will especially cherish what we have worked hard but haven't got. Therefore, the TV series will tell you

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Moroccan football team: "The most familiar stranger"

　　When I was still in college ten years ago, I led a sightseeing group of more than 30 Moroccan students. Before meeting them, my general impression of the Moroccans was that they are from North Africa but closer to the Arab world. They have religious beliefs, are used to worship, and are inextricably linked with France. 　　When I saw the real person, I realized that the North Africans in front of me were actually a group of children playing with each other and having fun in time. They were about the same age as me at the time. I have all kinds of nicknames and nicknames. During the process of taking them to Badaling, the Summer Palace and Houhai, two classmates and I, together with more than 30 Moroccan students, realized "cultural integration" and "world unity" in the small group to some extent. 　　During the World Cup in Qatar, I was surprised to find that the little-known Morocco team, which was eliminated in the group stage of the last World Cup, after miraculou

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Your appearance determines whether you can be studied

　　Everyone has a love of beauty—scientists are no exception. 　　In May 2021, a study published in "Nature Plants" (Nature Plants) found that those beautiful flowers have more chances to become the research objects chosen by researchers. In other words, appearance not only affects finding a partner, but also affects whether one can become a subject of research. 　　In fact, not only appearance, but also many factors will cause researchers to be unable to treat all research objects equally. The sense of existence of different species is really different, and the well-known species have a higher chance of being studied. Everyone has probably heard of the koala (Phascolarctos cinereus), but how many of you know the less popular but more endangered Queensland hairy-nosed wombat (Lasiorhinus krefftii)? There are more than 5,000 papers on koalas that can be searched on Google Scholar, and 616 related pictures on Wikimedia Commons; while papers on Queensland wool-nosed wombats are less

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